Stackable bunghole barrel of synthetic resin

Abstract

A filling and discharge bunghole bunghole (9) and an aerating and venting bunghole (10) are arranged in protected fashion in depressions (11, 12) of the lid portion (4) of the bunghole barrel. The stacking surface (8) of the lid portion (4) passes over into two webs (17, 18) extending in the circumferential direction and encompassing the bottom surface of the depression (11) for the filling and discharge bunghole (9), these webs running with a slight slope from the stacking surface (8) toward the bottom surface of the depression (11) and forming, in the slightly tilted upended position (1') of the bunghole barrel, drainage channels (21, 22) for the residual fluid (24) collecting on the inside (27) of the lid portion (4) and flowing off through the bunghole opening (15) of the filling and discharge bunghole (9).

What is claimed is: 
     
       1. In a stackable bunghole barrel of a synthetic resin, with a blow-molded sidewall portion, a bottom portion, and a lid portion with a stacking surface, a filling and discharge bunghole, as well as an aerating and venting bunghole, and a device for residual emptying, wherein the bungholes are hidden in depressions of the lid portion and the depression formed in the lid portion exhibits, for accommodation of the filling and discharge bunghole, a bottom surface with a bunghole opening, this surface being arranged symmetrically to the connecting axis of the diametrically opposed bungholes and being connected, by way of a shoulder, with the stacking surface of the lid portion, wherein the stacking surface (8) passes over into two ramp-like webs (17, 18) extending in the marginal zone and in the circumferential direction of the injection-molded lid portion (4) and encompassing the bottom surface (14) of the depression (11) for the filling and discharge bunghole (9), these webs extending with a slight gradient from the stacking surface (8) of the lid portion (4) toward the bottom surface (14) of the depression (11) for the filling and discharge bunghole (9) and forming, in the slightly tilted upended position (1') of the bunghole barrel (1), drainage channels (21, 22) for the residual fluid (24) collecting on the inside (23) of the lid portion (4) and flowing out through the bunghole opening (15) of the filling and discharge bunghole (9), the ramp-like webs (17, 18) of the lid portion (4) having, for the formation of drainage channels (21, 22) in the upended position (1') of the bunghole barrel (1), a reverse V-shaped cross-sectional profile (19) with a height (20) which decreases in correspondence with their gradient from the stacking surface (8) of the lid portion (4) toward the bottom surface (14) of the depression (11) for the filling and discharge bunghole (9); the improvement wherein the webs (17, 18) have an asymmetrical, V-shaped cross-sectional profile (19) the differently long legs (19a, 19b) of which have different acute angles of inclination (α, β) with respect to the bottom surface (14) of the depression (11) for the filling and discharge bunghole (9). 
     
     
       2. Bunghole barrel according to claim 1, characterized in that the webs (17, 18) of the lid portion (4) which from the drainage channels (21, 22) exhibit a gradient of 6°-14°. 
     
     
       3. Bunghole barrel according to claim 1, characterized by a rib-like elevation (26) arranged on the connecting axis (13--13) between the two bungholes (9, 10), this elevation extending from the annular groove (7) between the supporting and roller chime (5) and the bottom (6) of the lid portion (4) to the filling and discharge bunghole (9) and forming, on the inside (27) of the depression (11) accommodating the filling and discharge bunghole (9), in the upended position (1') of the barrel (1), a drainage channel (28) leading into the filling and discharge bunghole (9). 
     
     
       4. Bunghole barrel according to claim 3, characterized in that the rib-like elevation (26) slightly ascends from the annular groove (7) toward the base of the filling and discharge bunghole (9) in such a way that the drainage channel (28), in the upended position (1') of the barrel (1), extends with a slight slope toward the filling and discharge bunghole (9).